TIFFReadTile

Section: Misc. Reference Manual Pages (3T)
Updated: December 16, 1991
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NAME

TIFFReadTile - read and decode a tile of data from an open TIFF file

SYNOPSIS

#include <tiffio.h>
int TIFFReadTile(TIFF* tif, u_char* buf, u_long x, u_long y, u_long z, u_int sample)

DESCRIPTION

Return the data for the tile containing the specified coordinates. The data placed in buf are returned decompressed and, typically, in the native byte- and bit-ordering, but are otherwise packed (see further below). The buffer must be large enough to hold an entire tile of data. Applications should call the routine TIFFTileSize() to find out the size (in bytes) of a tile buffer. The x and y parameters are always used by TIFFReadTile(). The z parameter is used if the image is deeper than 1 slice (ImageDepth>1). The sample parameter is used only if data are organized in separate planes (PlanarConfiguration=2). TIFFReadTile returns -1 if it detects an error; otherwise 1 is returned.

NOTES

The library attempts to hide bit- and byte-ordering differences between the image and the native machine by converting data to the native machine order. Bit reversal is always done if the FillOrder tag is opposite to the native machine bit order. Byte swapping of 16- and 32-bit samples is automatically done when Compression=1 (``no compression''), but otherwise is left to the decompression algorithms (which should generate decompressed data in the native byte ordering of the machine).

DIAGNOSTICS

All error messages are directed to the TIFFError(3T) routine.

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